Android Development Android Background Processing

Question 1

Which Jetpack library is the recommended solution for deferrable background work in Android?

Accepted Answer

WorkManager

Answer

WorkManager is the recommended Jetpack library for deferrable, guaranteed background work that is constraint-aware and battery-friendly.

Question 2

What is a coroutine in Kotlin?

Accepted Answer

A lightweight concurrency primitive that can suspend and resume execution

Answer

Kotlin coroutines are lightweight concurrency primitives that allow you to write asynchronous, non-blocking code in a sequential style.

Question 3

Which coroutine dispatcher should be used for CPU-intensive tasks in Android?

Accepted Answer

Dispatchers.Default

Answer

Dispatchers.Default uses a shared thread pool optimized for CPU-intensive computation tasks like sorting and parsing.

Question 4

Which WorkManager class represents a single unit of background work?

Accepted Answer

Worker

Answer

Worker is the class you extend to implement the background task logic in WorkManager, overriding the doWork() method.

Question 5

What is the purpose of Dispatchers.IO in Kotlin coroutines?

Accepted Answer

For network and disk I/O operations

Answer

Dispatchers.IO uses a larger thread pool optimized for blocking I/O operations like file reads, network calls, and database queries.

Android Development Practice Test